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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Common stock issuance, net of offering cost (in shares) 360,815      
Common stock, issuance cost (in Dollars)       $ 139
Cash dividends (in dollars per share)   $ 1.07 $ 1.04 $ 1.04
Common Stock [Member]        
Common stock issuance, net of offering cost (in shares)   585 400  
Dividend reinvestment and purchase plan (in shares)   20,393 19,791 25,751
Cash dividends (in dollars per share)     $ 1.04 $ 1.04
Retained Earnings [Member]        
Cash dividends (in dollars per share) $ 0.81      
Treasury Stock [Member]        
Dividend reinvestment and purchase plan (in shares) 11,712      
Purchase of treasury stock (in Shares)   196,635